diff --git a/synapse/storage/databases/main/filtering.py b/synapse/storage/databases/main/filtering.py
index fff417f9e3..047de6283a 100644
--- a/synapse/storage/databases/main/filtering.py
+++ b/synapse/storage/databases/main/filtering.py
@@ -13,10 +13,9 @@
# See the License for the specific language governing permissions and
# limitations under the License.
-from typing import Optional, Tuple, Union, cast
+from typing import TYPE_CHECKING, Optional, Tuple, Union, cast
from canonicaljson import encode_canonical_json
-from typing_extensions import TYPE_CHECKING
from synapse.api.errors import Codes, StoreError, SynapseError
from synapse.storage._base import SQLBaseStore, db_to_json
diff --git a/synapse/storage/databases/main/keys.py b/synapse/storage/databases/main/keys.py
index 1666e3c43b..cea32a034a 100644
--- a/synapse/storage/databases/main/keys.py
+++ b/synapse/storage/databases/main/keys.py
@@ -188,7 +188,7 @@ class KeyStore(SQLBaseStore):
# invalidate takes a tuple corresponding to the params of
# _get_server_keys_json. _get_server_keys_json only takes one
# param, which is itself the 2-tuple (server_name, key_id).
- self._get_server_keys_json.invalidate((((server_name, key_id),)))
+ self._get_server_keys_json.invalidate(((server_name, key_id),))
@cached()
def _get_server_keys_json(
diff --git a/synapse/storage/databases/main/stats.py b/synapse/storage/databases/main/stats.py
index f34b7ce8f4..6298f0984d 100644
--- a/synapse/storage/databases/main/stats.py
+++ b/synapse/storage/databases/main/stats.py
@@ -19,6 +19,7 @@ from itertools import chain
from typing import (
TYPE_CHECKING,
Any,
+ Counter,
Dict,
Iterable,
List,
@@ -28,8 +29,6 @@ from typing import (
cast,
)
-from typing_extensions import Counter
-
from twisted.internet.defer import DeferredLock
from synapse.api.constants import Direction, EventContentFields, EventTypes, Membership
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